Exercise bicycle



1.1 is a front perspective view of an exercise bicycle showing our new design;

1.2 is a left side view thereof;

1.3 is back view thereof;

1.4 is a back perspective view thereof;

1.5 is a right side view thereof; and

1.6 is a top view thereof.

2.1 is a front perspective view of the design shown in FIG. 1 showing our new design in an alternative embodiment;

2.2 is a left side view of thereof;

2.3 is a top view thereof;

2.4 is a right side view thereof;

2.5 is a back view thereof;

2.6 is a front view thereof; and

2.7 is a bottom view thereof. 

CLAIM The ornamental design for an exercise bicycle, as shown and described. 